Zapdos - Pokemon Snap

Go to the Tunnel level. Then just after the first door you will see a Pikachu next to a large egg in the distance. Throw some apples to lure the Pikachu closer to the egg. When Pikachu gets close enough, play the Poké Flute. Pikachu will start a Thundershock attack and zap the egg. The egg will hatch and Zapdos will appear. Note: You will need Zapdos to shock the generator if you want the Pokémon sign.